Multiple lifting-jack.



A. H. SUHOLLE.

MULTIPLE LIFTING JACK. APPLICATION FILED MAY 11, 1909.

Patnmdl June 21, 1910.

3 imam/06 UNI TED S' lht'illltltl ALBERT H. SCHOLLE,

PATENT orjrren.

OF NEW" YORK, N. Y.

MULTIPLE LIFTING-3ACK.

To all whom it may concern:

Be it known that I. Anmnrr ll. Scnorrn, a citizen of the United States of Anterior, and a resident of New York, in the county and Flt-ate of New York, have invented certain new and useful Improvements in Multiple Lifting-Jacks, of which the following is a specification.

This invention has reference to a novel multiple lifting jack.

It is the special object of my inventioir to produce a lifting jack composed of a multiple of single jacks which are operated from a common central point by one operatlug device whereby all the jacks may simultaneously he raised or lowered as desired. In this way a saving; of time and labor is effected.

in order to render the novel lifting jack useful for various amilieations means are provided which enable the operator to raise the front jacks alone and thereby but one portion of an object. Likewise the rear jacks alone may be raised and also those jacks located on either side of the device. To attain these desirable results the jacks are mounted on a common frame and connect with each other and the central opcrating device. By simplicity in construction. particularly by the use, of but one operating device fo all the jacks, the cost of production is kept. low. Means are provided on the device to permitv of the n'ioving of the whole. apparatus about the ground or tloor which means may be operated by one element of the operating device, and it has been soughtv to produce a neat and desirable article, all as will be fully described herein after with reference to the accompanying drawing, in which:

F i gure '1 represents a multiple lifting jack in section on line 1, 1 of Fig. 2 embodying in desirable form the present; iinprtwements. Fig. 2 is a top plan view of some. Fig. 3 is a detail View of a portion of one of the jacks in sectional elevation on line 3, 3 of Fig. 4, and Fig; 4 shows in elevation said portion of one of the jacks at a right angle to Fig. 3.

Simila r characters of reference denote like parts in all. the figures. For various applications a ditt'erent numher of lifting jaeks um 'y be combined with one operating device. in 'most; cases, however, a device composed of four lifting jacks Specification of Letters Patent.

Pntented dune 2t. it) to 1909. Serial No. 485,286.

sists of liftin 'acks A connected h a t'rame work preferably made of tubular main bars I) and struts I), the whole being mounted on asters b so that it. may be easily moved about. To facilitate this a handle o is provided attached. to the frame. consist each of a cylinder 1; into which a plunger (L2 is inserted. lhis plunger may be moved up and down in the-cylinder but is prevented from turning therein by the ends of tapbolts a passing through the wall of the cylinder a into grooves an formed in the plungcrs, as cl arly shown in the seetional detail View Fig. 3. On the top'cnds ot' the plnngers there are crutches a adapted to engage the axles of an auton' obile or other vehicle. On each plunger a strong screw thread is Formed. and engaging therewith is a nut C that l'trds on the top of the cylinder 1/. By turning this not evidently the plunger 1/ may he raised or low cred respectively. The means for turning the nut is as follows: The nut on its lower face has a flange r" on which there are formed teeth extending; upward.- Sun rounding the upper part of the lint and con centric with it, is a sprocket wheel I). the

hub of which is provided at its lower face with downwardly projecting teeth meshing with the teeth 0 of the not C aforementioned. The two sets of teeth r and on of the two members U and l) constitute, in fact, a clutch that enables the nut U to be driven by the sprocket when the teeth are in engagement, or, to be left unatl'ected by the sprocket when the latter is. lifted so as to disengage the clutch. 'lhe lifting or lowering of the sprocket l) to open or close the clutch is effected byla canrpieee d forming the short arm of a forked lever (1" pivoted on thetap-bolts a aforementioned. All four jacks and their accessoi'ies areconstructed alike except that the forked levers d of those two jacks nearest the operating end. that. is, to the right in Figs. 1 and 2 have each a hand piece (1 directly on the end of their long arms, while for the other two jacks connecting rods ll are attached to the forked levers d extending to the rightv and terminating in handles d near the operating The jacks A r end for the convenience of the person using the device. A central sprocket wheel E is mounted on a vertical shaft a supported in bearings on the main frame, and capable of being intermittently rotated by a ratchet and pawl c" the latter being mounted on a ratchet lever The pawl c is a double one, and either its left or its right tooth can be made to engage the ratchet c by bringing to bear on it either the one or the other of the two pawl springs a and c as clearly shown in Figs. 1 and 2. Connecting the central sprocket E with the four sprockets l) of the jacks is an endless chain F.

The operation of the apparatus is as follows: The device is rolled to the proper position 'under the two axles of a motor car. for instance. which is easily done by the handle I). If it is desired to raise thecar oil the ground bodily. the clutches of all the l'oul' jacks are brought into engagementhy releasing their operating levers. Th ratchet lever is then swung to and fro thus driving the sprocket E, the chain l, and the sprockets D, and with these the nuts (1 whereby the plungers a are raised to any required height, and with them the car resting with its axles on the four crutches a. if it be desired to raise onl one end of the car, say, the rear end, ony the two rear jacks are operated by disengaging the clutches of the other two. Similarly, if the front of the car is to be raised, only the front jacks are operated. Likewise the vehicle may be raised on one side only by using one front, and one rear jack. To let down the car the movement is reversed by swinging the pawl spring 0- away from, and the other spring 6 into engagement with the, pawl e.

I claim as my invention: 1. A multiple lifting jack adapted to be operated from a common central point, comprising a plurality of single jacks with stationary cylinders, a frame composed of horizontal rigid members connecting the stationary cylinders and always retaining its fixed position during operation, an operating device common to i l jacks and in connection therewith, means in connection with the operating device for raising and lowering all the jadks simultaneously, and means for making inoperative some of the jacks.

2. A multiple lifting jack adapted to be operated from a common central point, comprising a plurality of single jacks consisting each of a cylinder, a threaded plunger therein having vertical grooves, tapbolts passing through the cylinder one into each groove, a frame composed of horizontal rigid members connecting with the cylinders of the jacks and always retaining its fixed position during operation, an operating device common to all jacks and in connection therewith, means for raising and lowering all the jacks simultaneously, and means for makingguoperatlve some of the acks.

3. A iiiultiple lifting jack adapted to be 4 operated from a common central point, coniprising a plurality of single jacks each consisting of a cylinder with caster below, a threaded plunger therein having vertical grooves, tapbolts passing through the cylini the main frame, a central sprocket wheel therein, an endless chain connecting all the sprocket wheels, and means for operating the central sprocket wheel.

4. A. multiple lifting jack adapted to be operated from a common central point, comprising a plurality of single jacks each consisting of a cylinder with caster below, a threaded plunger therein having vertical grooves, tapbolts passing through the cylinder into said grooves, a rigid frame connecting the cylinders, a nut mounted on the top of each cylinder engaging with the thread of the plunger, a flange on the lower face of said nut having upwardly extending teeth, a sprocket wheel concentric with the nut having a hub provided at its lower face with downwardly projecting teeth, the nut and sprocket wheel forming a clutch, bearings on the main frame, a central sprocket wheel therein, an endless chain connecting all the sprocket wheels, means for operating the central sprocket wheel, and means in connection with the clutch to make indperat-ive some of the jacks.

5. A multiple lifting jack adapted to be operated from a common central point comprising a plurality of single jacks each consisting of a cylinder, a threaded plunger therein having vertical rooves, tapholts passing throu h the cyfirider into said grooves, a rigid frame connecting the cylinders, a nut mounted on the top of each cylinderengaging the thread of the plunger, 21

sprocketwheel concentric with the nut forming a clutch therewith, a central sprocket wheel, an endless chain connecting all the sprocket Wheels, a double ratchet and pawl with ratchet giever incoi ectionfiwith the central sprocket wheel, an means for operating the clutches.

Signed at New York, N. Y., this 4th day of May, 1909.

ALBERT H. SCHULLE.

Witnesses Lnowro K. Born, F LORA GREENWALD. 

